Journal ArticleDOI
Rietveld refinement of Debye–Scherrer synchrotron X‐ray data from Al2O3
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In this paper, the application of the Rietveld refinement technique to synchrotron X-ray data collected from a capillary sample of Al2O3 in Debye-Scherrer geometry is described.Abstract:
The application of the Rietveld refinement technique to synchrotron X-ray data collected from a capillary sample of Al2O3 in Debye–Scherrer geometry is described. The data were obtained at the Cornell High Energy Synchrotron Source (CHESS) with an Si(111) double-crystal monochromator and a Ge(111) crystal analyzer. Fits to a number of well resolved individual peaks demonstrate that the peak shapes are very well described by the pseudo-Voigt function, which is a simple approximation to the convolution of Gaussian and Lorentzian functions. The variation of the Gaussian and Lorentzian half widths, ΓG and ΓL, with Bragg angle can be approximated quite closely by the functions V tan θ and X/cos θ which represent the contributions from instrumental resolution and particle-size broadening respectively. Rietveld refinement based on this model yields generally satisfactory results. The refined values of V and X are consistent with the expected vertical divergence (≃0.1 mrad) and the nominal particle size (≃ 0.3μm). In particular, the use of a capillary specimen virtually eliminates preferred orientation effects, which are highly significant in flat-plate samples of this material.read more
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Compressive, shear, and fracture behavior of CNT reinforced Al matrix composites manufactured by severe plastic deformation
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Journal ArticleDOI
Single-Step Delamination of a MWW Borosilicate Layered Zeolite Precursor under Mild Conditions without Surfactant and Sonication
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Aluminum Phenylphosphonates: A Fertile Family of Compounds.
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Chemical bonding origin of the unexpected isotropic physical properties in thermoelectric Mg 3 Sb 2 and related materials.
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Preparation of synthetic rutile by hydrochloric acid leaching of mechanically activated Panzhihua ilmenite
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